RecyclerView “Cannot resolve symbol” error

Question

I'm trying to setup a RecyclerView in my Android Project but i cannot refer to my list because using the code "recyclerView = view.findViewById(R.id.list)" give me the error Cannot resolve symbol "list". If I try to type "R.id." i cannot find R.id.list but I'm sure that I give it the id "list".

I just added dependencies and the import statement in my code. I tried to resync and clean project but with no result.

here my dependencies (build.gradle (app)):

implementation 'androidx.cardview:cardview:1.0.0'
implementation 'androidx.recyclerview:recyclerview:1.0.0'

here my import:

import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.appcompat.app.AppCompatActivity;

here the wrong code:

 @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

          recyclerView = view.findViewById(R.id.list);
    }

here the declaration of the RecyclerView in the xml file:

  <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </androidx.recyclerview.widget.RecyclerView>

Thank you in advance!

Answer 1

Try File > Invalidate Caches / Restart

Also, shift this code to onCreateView()

recyclerView = view.findViewById(R.id.list);

Where view should be the view you get after inflating.

Answer 2

关闭项目，然后尝试使用rm -r /pathToYourProject/.gradle删除.gradle和.idea，然后打开项目并进行同步

Answer 3

Try in your activity:

 import your.project.name.R;

Hope it helps.

Answer 4

you forget somthing

just set this line before recyclerView = view.findViewById(R.id.list);

setContentview(R.layout.THE_LAYOUT_THAT_CONTAIN_YOUR_RECYCLERVIEW);